Method of increasing retention of scale inhibitor in subterranea

Details Method of increasing retention of scale inhibitor in subterranea Method of increasing retention of scale inhibitor in subterranea

1989-02-02

1990-08-14

Suchfield, George A.

Wells

Processes

Material placed in pores of formation to treat resident...

166310, 252 8552, E21B 4312

Patent

active

049479342

ABSTRACT:
A method for inhibiting the formation of scale in a well penetrating a subterranean formation for the production of fluids from the formation comprising injecting into the formation an acidic aqueous solution having a pH effective to form a water-soluble complex of the inhibitor and the polyvalent cation, preferably in the range of 2 to 3, containing a mixture of a polyacrylate scale inhibitor having a molecular weight range from 500 to 10,000 and a polyvalent cation wherein the equivalent ratio of polyvalent cation to polyacrylate scale inhibitor is less than or equal to 0.5 in the acidic aqueous solution and allowing natural conditions in the formation to raise the pH of the solution an amount sufficient to cause controlled precipitation and increased deposition of the scale inhibitor in situ in the form of the polyvalent cation-polyacrylate complex. The scale inhibitor solution employed in this method avoids premature plugging of the formation, substantially extends the lift of the treatment and the polyvalent cation complex of the polyacrylate is fully inhibitive.

REFERENCES:
patent: 3827977 (1974-08-01), Miles et al.
patent: 4046707 (1977-09-01), Smith et al.
patent: 4563284 (1986-01-01), Amjad
patent: 4579676 (1986-04-01), Bull

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